EP4175123A1 - Rotor pour une machine tournante dynamoélectrique - Google Patents

Rotor pour une machine tournante dynamoélectrique Download PDF

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Publication number
EP4175123A1
EP4175123A1 EP21205055.3A EP21205055A EP4175123A1 EP 4175123 A1 EP4175123 A1 EP 4175123A1 EP 21205055 A EP21205055 A EP 21205055A EP 4175123 A1 EP4175123 A1 EP 4175123A1
Authority
EP
European Patent Office
Prior art keywords
rotor
short
circuit ring
openings
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21205055.3A
Other languages
German (de)
English (en)
Inventor
Axel Knauff
Johannes Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP21205055.3A priority Critical patent/EP4175123A1/fr
Publication of EP4175123A1 publication Critical patent/EP4175123A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/26—Rotor cores with slots for windings
    • H02K1/265—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors

Definitions

  • Rotors of electric motors are exposed to high mechanical loads at high speeds. Centrifugal forces create high mechanical stresses in annular sections of the rotor.
  • the version with rounded corners according to FIG 1 is applied to increase a cross-sectional area of a cage bar of a squirrel cage and thus decrease resistance.
  • the object of the invention is to improve this.
  • a rotor for a dynamo-electric rotary machine having a plurality of axially extending openings, the openings being disposed at least substantially about a center point, at least one radial end of the opening having an elliptically shaped portion.
  • An embodiment is advantageous according to which the elliptically shaped section has an elliptical ratio of height to width which is between 0.2:1 and 0.6:1.
  • the opening has at least one circular section, the circular section being formed adjacent to the elliptical section.
  • This embodiment can be manufactured particularly well, since the circular section is formed by the milling tool itself when the opening is milled.
  • a transition from the circular section to the elliptical section is advantageous where a radius of curvature of the circular section is the same or at least almost the same (for example a deviation of 10%) as a radius of curvature of the elliptical section.
  • An embodiment is advantageous according to which the rotor has a short-circuit ring, the openings being formed in the short-circuit ring, the elliptically shaped section being formed at a radial end pointing in the direction of the center point.
  • the elliptical section points towards the center.
  • the short-circuit ring has a plurality of short-circuit ring disks which are materially bonded to one another, in particular welded to one another.
  • the short-circuit rings can be inexpensive, e.g. B. by stamping.
  • the short-circuit ring disks can also be made of higher-strength material in order to ensure operation at higher speeds.
  • An embodiment of the rotor is advantageous, having a rotor stack, with the openings being formed in the rotor stack.
  • the openings can be designed as grooves in the rotor stack.
  • Prefabricated cage bars can be inserted into the grooves.
  • the cage bars advantageously protrude beyond the rotor stack.
  • the cage bars can be connected to the shorting ring to form a squirrel cage.
  • An embodiment is advantageous according to which the rotor core has a plurality of rotor laminations.
  • a sheet metal section preferably has the openings described.
  • the openings can be formed in a short-circuit ring, in a short-circuit ring disk or else in a rotor lamination of a rotor stack.
  • openings with an elliptical section in a short-circuit ring and to form a different type of opening in the rotor stack, preferably by means of the rotor laminations.
  • a short-circuit ring for a rotor having a plurality of axially running openings, the openings being arranged at least essentially all around a center point, with at least one radial end of the opening pointing in the direction of the center point having an elliptically shaped section having.
  • the opening has at least one circular section, the circular section being formed adjacent to the elliptical section.
  • the short-circuit ring advantageously has a plurality of short-circuit ring disks.
  • the short-circuit ring can advantageously be connected to cage bars protruding from a rotor stack of the dynamoelectric rotary machine by means of the openings.
  • a squirrel-cage cage for a squirrel-cage asynchronous machine can thus be formed.
  • the task is also solved by a short-circuit ring disc for a short-circuit ring.
  • a rotor core for a rotor having a plurality of axially extending openings, the openings being arranged at least essentially all around a center point, with at least one radial end of the opening pointing in the direction of the center point having an elliptically shaped section having.
  • the opening has at least one circular section, the circular section being formed adjacent to the elliptical section.
  • the rotor stack advantageously has a plurality of rotor laminations.
  • the task is also solved by a rotor lamination for a rotor stack.
  • the openings are advantageously realized in the sheet metal section.
  • the task is also solved by a dynamo-electric rotary machine having a rotor.
  • the machine is an asynchronous machine, for example.
  • the cage bars are preferably prefabricated.
  • the cage bars have z. B. aluminum and / or copper.
  • the short ring disks have z. B. aluminum and / or copper.
  • the cage bars are preferably pressed or pressed into the axially running openings or grooves of the rotor core.
  • a short-circuit ring disk or a plurality of short-circuit ring disks is preferably then placed on the cage bars protruding from the rotor assembly.
  • a heat input into the material is advantageously controlled in such a way that at least a quarter (viewed radially), preferably a half, of the cage bar is bonded to the surrounding material of the annular short-circuit disk. This advantageously applies analogously to the integral connection of the annular short-circuit disks.
  • FIG 1 shows an opening 10 known from the prior art. A central axis 20 is also shown.
  • the opening 10 is known as the opening of a shorting ring.
  • the opening 10 has rounded corners in the figure.
  • FIG 2 shows an embodiment of an opening 1.
  • One end of the opening 1 has an elliptically shaped section 5 .
  • the elliptical section 5 corresponds to a part of an ellipse located below a main axis of the ellipse. A part of the ellipse located above the main axis of the ellipse is also indicated in the figure.
  • a width B of the elliptical section 5 is defined by the main axis of the ellipse.
  • a height H shown in the figure is defined by the minor axis of the ellipse.
  • the elliptically shaped section advantageously has an elliptical ratio of height to width. This is advantageously between 0.2:1 and 0.6:1.
  • the width B of the ellipse is, for example, at least 0.5 mm and at most 8 mm.
  • the width B is particularly advantageously at least 1 mm and at most 6 mm.
  • One embodiment may be 4.6mm wide. In particular, a version between 3 mm and 5 mm can be used well.
  • the figure also shows the legs 50 and 51 of the opening, which are adjacent to the elliptical section 5 in the figure.
  • the legs 50 and 51 can be arranged parallel to one another. However, the arrangement shown in the figure is advantageous, according to which imaginary extensions of the two legs 50, 51 enclose an angle ⁇ .
  • the angle ⁇ can e.g. B. between 3 ° and 4 °.
  • a center point of the angle does not coincide with the axis of rotation of the rotor, since the tooth width is usually chosen to be constant.
  • angle ⁇ is advantageously dependent on the number of rotor slots Nr.
  • An embodiment is particularly advantageous, according to which a leg 50 (can also be referred to as a flank) of an opening is parallel to the leg 51 of an adjacent opening (cf. e.g. FIG 7 ) is trained.
  • the opening 11 has two circular sections 7 and 8 in the figure.
  • the circular sections 7, 8 are formed adjacent to the elliptical section 5.
  • the circular section 7 or 8 can, for. B. have the shape of a circular segment.
  • a radius of the circular segment is, for example, at least 0.5 mm and at most 3 mm.
  • a radius of the circular segment of 1.5 mm is particularly advantageous.
  • the circular section 7 or 8 is advantageous from a manufacturing point of view.
  • the opening 11 can be formed, for example, in a ring to form a short-circuit ring 2 or a short-circuit annular disk 4...46 (see FIG 4 ) are milled.
  • a radius of the circular section 7 or 8 then advantageously corresponds to a radius of a milling tool.
  • an ellipse ratio between 0.2:1 and 0.6:1 is advantageous, for example also 0.3:1.
  • the openings 1 and 11 shown can be formed in a short-circuit ring 2, in a short-circuit ring disk 4...46 or also in a rotor lamination of a rotor stack 24.
  • FIG 2 and 3 shown openings in a short-circuit ring and a different type of opening, for example as in FIG 1 shown to form in the rotor core, preferably by means of the rotor laminations. Then the cage bar 3 with the in FIG 4 shown notch 31 are provided.
  • FIG 4 shows a rotor 21 in a view in which a section through a cage bar 3 and also through the opening 11 was made.
  • FIG 5 shows the rotor 21 in a view in which a section was made through a tooth (without reference number).
  • FIG 4 and 5 show a short-circuit ring 2, which is formed of six short-circuit ring disks 4, 41, 42, 43, 44, 45 in the figures—purely by way of example.
  • the figures show cage bars 3 protruding from a rotor core 24 .
  • a weld 46 is in 5 shown.
  • the short-circuit ring disks 4...45 can have shape deviations 47, 48 to form a trough.
  • welding material can be introduced easily.
  • the short-circuit ring 2 does not rest on a shaft 25 .
  • FIG 4 an embodiment is shown in which the openings of the short-circuit ring 2 differ from those of the rotor core 24 differentiate.
  • the cage bar 3 is here provided with a notch.
  • the notch has a notch surface 31 in the figure.
  • the notch is advantageously arcuate to ensure good force distribution.
  • the notch can also have the shape of a segment of a circle.
  • Other shapes for example an elliptical shape, are also possible.
  • the figure also shows a cage bar 3 with a notched area 311, a transition area 310 and a further area 312, which is advantageously located within the laminated core 24.
  • a notched area 311 (can also be called area with a notch) is in the figure in an opening of the short-circuit ring 2, the short-circuit ring 2 also being formed in this figure by a plurality of short-circuit rings 4,...,45.
  • the squirrel-cage cage ie a plurality of electrically conductive cage bars 3 and at least one electrically conductive short-circuit ring 2, preferably two electrically conductive short-circuit rings 2, are advantageously part of an asynchronous machine.
  • All cage bars 3 advantageously have a notched area 311 .
  • the transition area 310 shown advantageously has a rounding, so a stress on the cage bar 3 can be kept low in this area.
  • An arcuate transition or a transition in the shape of a segment of a circle is advantageous.
  • the figure also shows that the end of the notched portion 311 is coplanar with one end of the shorting ring 2 .
  • the cage bar 3 does not fill the opening 11 completely. Cavities are visible. These are filled with air L, for example.
  • the figure also shows that in FIG 4 described variant of the cage bar 3 with notch surface 31.
  • FIG 7 shows the rotor 21 in a front view.
  • the rotor 21 has a plurality of openings 11 .
  • the figure also shows the short-circuit ring 2 and the shaft 25.
  • the openings 11 run axially, relating to an axis of rotation of the rotor 21, as already shown in FIG FIG 4 shown.
  • the openings 11 are arranged around a center point M, with at least one radial end of the opening 11 having an elliptically shaped section 5 .
  • FIG 8 shows an FEM image (finite element method) of the in FIG 1 shown opening 10 formed in a shorting ring.
  • the corners of the opening 10 are rounded or rounded, for example with a rounding of 0.5 mm.
  • FIG 9 shows a FEM image of the in FIG 2 shown opening 11, which is formed in a short-circuit ring.
  • the elliptical section results in a much more even stress that is significantly lower at the peaks.
  • FIG. 10 shows the dynamo-electric rotary machine 23, having a rotor 21 with a shaft 25 and a rotor core 24, in particular a laminated core, and a stator 22.
  • FIG. 11 shows a method for manufacturing the rotor 21.
  • step S1 the rotor stack is provided.
  • cage bars are inserted into the axially extending openings of the rotor stack.
  • step S3 at least one annular short-circuit disk is attached to cage bars protruding from the rotor assembly.
  • step S4 the annular short-circuit disk is connected to the cage bars in a cohesive manner, in particular by means of welding.
  • At least one further annular short-circuit disk can be attached in a method step S5.
  • a cohesive connection, in particular by means of welding, of the annular short-circuit disks to one another and to the cage bars is achieved in a method step S6.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP21205055.3A 2021-10-27 2021-10-27 Rotor pour une machine tournante dynamoélectrique Withdrawn EP4175123A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21205055.3A EP4175123A1 (fr) 2021-10-27 2021-10-27 Rotor pour une machine tournante dynamoélectrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21205055.3A EP4175123A1 (fr) 2021-10-27 2021-10-27 Rotor pour une machine tournante dynamoélectrique

Publications (1)

Publication Number Publication Date
EP4175123A1 true EP4175123A1 (fr) 2023-05-03

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EP21205055.3A Withdrawn EP4175123A1 (fr) 2021-10-27 2021-10-27 Rotor pour une machine tournante dynamoélectrique

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EP (1) EP4175123A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2591537A2 (fr) * 2010-07-09 2013-05-15 BRUSA Elektronik AG Rotor feuilleté pour machine électrique tournante
US20210028675A1 (en) * 2018-03-12 2021-01-28 Siemens Mobility GmbH Method for producing a squirrel-cage rotor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2591537A2 (fr) * 2010-07-09 2013-05-15 BRUSA Elektronik AG Rotor feuilleté pour machine électrique tournante
US20210028675A1 (en) * 2018-03-12 2021-01-28 Siemens Mobility GmbH Method for producing a squirrel-cage rotor

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